| 摘要 |
The present invention relates to a lens barrel with an extender attachable thereto, and comprises a focusing lens movable in directions of an optical axis, a position detecting member for detecting a position of the lens, a data detecting member for detecting information on the extender, and a forbidding member for setting a permissible area in which the autofocusing is permitted with respect to the position of the lens based on the information, permitting the autofocusing when the position of the lens is within the permissible area, and forbidding the autofocusing when the position of the lens is out of the permissible area.
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